Yarn tensioning device



April 14, 1959 J. WARWICK YARN'TENSIONING DEVICE Filed June 12, 1956INVENTOR John WarwcK ATTORNEY United vStates Patent D YARN `TENSIONLNGDEVICE John "Warwick, Livingston, NJ., assignor to SpecialtiesDevelopment Corporation, Belleville, NJ., a corporation of New yJerseyApplication June 12, 1956, Serial No. 590,875

3 Claims. (Cl. 242-150) The present invention relates to yarn tensioningdevices, and, more particularly, to disc type yarn tensioning deviceswhich are suitable for tensioning spun yarns as well as other types ofyarn.

Heretofore, Ythe continuous operation of devices for tensioning spunyarns, particularly cotton moving-athigh speed therethrough, has beenaccompanied by considerable difficulty in that -slivers, lintor otherparticles were detached from the yarn and accumulated between thetensioning -vdiscs. Such `accumulations eventually wedged the discsapart, resulting in the complete loss of the tension imparted to theyarn or the control of such tension. As a consequence, much operatingtime was lost duc to shut downs for inspection or cleaning of thetension devices.

Accordingly, an object of the present invention is to overcome theforegoing disadvantages by providing a disc type tensioning deviceadapted to expel yarn slivers or lint and the like, whereby shut downsfor inspection or cleaning are eliminated and no operating time is lost.

Another object is to accomplish the foregoing by means of elements whichare readily installed in existing disc type tensioning devices to renderthe same suitable for tensioning spun yarns as well as other types ofyarns.

A further object is to accomplish the foregoing in a simple, practicaland economical manner.

Other and further objects of the invention will be obvious upon anunderstanding of the illustrative embodiment about to be described, orwill be indicated in the appended claims, and various advantages notreferred to herein will occur to one skilled in the art upon employmentof the invention in practice.

In accordance with the present invention, the foregoing objects aregenerally accomplished by providing a yarn tensioning device having apair of discs in contact along an annular zone for receiving yarntherebetween, means such as a polished spindle, a post and a thrustbearing for mounting one of the discs for free axial rotation by theyarn, the rotatable disc having a central aperture formed with openingsor recesses located radially inward of the contact zone for receivingslivers, lint or other particles detached from the yarn and fordischarging the same to prevent accumulations between the discs.

A preferred embodiment of the invention has been chosen for purposes ofillustration and description, and is shown in the accompanying drawing,forming a part of the specification, wherein:

Fig. l is a fragmentary elevational view of a yarn tensioning device inaccordance with the present invention.

Fig. 2 is a sectional view taken along the line 2--2 on Fig. lillustrating the discs and the mounting means therefor.

Fig. 3 is a sectional view taken along the line 3--3 on Fig. l showingthe conguration of the rotatably mounted disc in accordance with thepresent invention.

Referring to the drawing in detail, there is shown, by way of example, ayarn tensioning device of the compensating type which comprises an upperdisc 10, a pres- 'ice sure system 11 for the upperdisc, a lowerdisc 12,and a lower mounting means `14 for the' lower disc.

The upper disc 10 preferably is chromium platedVhas a smooth contour,and isprovided with a highly polished annular zone `15 and a central,inverted cup-shaped formation 13. The pressure-system 11 bears on thetop of the formation 13 to maintain the underside` of the-formation incontact with a lpin or vrod 16 which is actuated to compensate forchanges in tension by a compensating bar 17 .adapted to be controlled inthe manner disclosed in United States Letters Patent No. 2,629,561.Lateral alignment of the .upper disc is maintained by looselypositioningthe formation l13 over a sleeve 19 which is part ofthemountng means 14.

The lower disc 12, as shown in Fig. 3, is generallycircular and has acentral aperture 20 through which the sleeve 19 extends to rotatablymount the lower disc. One or more recesses 21 extend radially outwardfrom the central aperture and one or more recesses 24 vextend radiallyinward from the outer periphery 22 for Vthe purposehereinafteridescribed. As illustrated herein, a plurality ofcircumferentially, preferably equidistantly, spacedrecesses 21 and V24areprovided.

As y-shown in Fig. 2, the lower disc 12 is generally concavo-convex incross section and has a raised annular section 25 adapted to abut theannular zone 15 of the upper disc 10 to provide an annular contact zonefor the discs located between the inner and youter recesses 21 and 24.The section 25 of the lower disc is chromium plated and is highlypolished to minimize friction tending to oppose relative rotation of thediscs 10 and 12.

In order to further arrange the lower disc for free rotation about itsaxis and with respect to the upper disc, the mounting means 14 includesa stud 26 which is fixed t0 the frame 27 of the device, has a bore forslidably mounting the rod 16, and is further provided with a shoulder 29for supporting a thrust bearing 30. A support 31 carries a resilientring 32 which is in frictional engagement with the outer periphery ofthe lower disc 12 to rotate therewith. The support has a stepped bore 34adapted to fit over the stud 26 and shoulder 29 thereof and to bearagainst the thrust bearing 30, and has a central upwardly projectingtubular portion 35 over which the sleeve 19 is disposed in close ttingrelationship. The upper surface of the support 31 has a radiallyoutwardly and downwardly inclined annular portion 36 between the sleeve19 and the ring 32 adapted to serve the purpose about to be described.

In operation, a strand of yarn Y, inserted between the discs 10 and 12,is maintained in a centrally offset position by contacting the sleeve 19and passes through the annular zone of contact of the discs. As the yarnis drawn between the discs at a rapid lineal speed, it transmits adriving torque to rotate or whirl the lower disc together with thesupport 31 at high speeds.

Particles which are detached from the yarn in passing between the discsenter the cavity defined by the sleeve 19, the upper disc 10 and thelower disc 12 but are maintained in a state of agitation by the rotationof the lower disc to facilitate entering the inner apertures or recesses21 and being deposited on the inclined portion 36. Due to the rotationof the lower disc and its support, particles so deposited are directedoutwardly by centrifugal force and are discharged through the recesses24.

The discs 10 and 12 have been shown in a horizontal position toillustrate the most adverse condition under which the device may beoperated to create a lint or sliver accumulation problem. However, itwill be appreciated that lint and sliver removal from between the discsis also facilitated should the discs be disposed in a vertical positionorin an inclined position between the horizontal and vertical positions.

While the means for preventing accumulations of lint or slivers havebeen illustrated and described in connection withk a yarn tensioningdevice of the compensating ltype, it will be apparent that such meansare equally applicable to devices which merely have a xed adjustment forcausing the discs to tension the yarn.

Also, it will be apparent that existing tension devices can be providedwith such means by embodying therein a disc 12 and a freely rotatablesupport for the disc such as disclosed herein.

From the foregoing description, it will, be seen that the presentinvention provides a simple and practical manner of preventing sliver orlint accumulations in yarn tensioning devices to thereby save'valuableytime otherwise lost in inspecting and cleaning such devices.

As various changes may be made in the form, construction and arrangementof the parts herein, without departing from the spirit and scope of theinvention and without sacrificing any of its advantages, it is to beunderstood that all matter herein is to be interpreted as illustrativeand not in any limiting sense.

I claim:

1. A yarn tensioning device comprising a pair of discs in contact alongan annular zone for receiving yarn therebetween, and means for rotatablymounting one of said discs for free rotation about its central axis bythe yarn, said rotatably mounted disc being generally concavo-convex incross section and having a central aperture formed with recess meanslocated inward of the contact zone and having recess means at its outerperiphery, said mounting means including a support for said rotatablymounted disc having an annular surface between the inner and outerrecess means and including means for mounting the support for freerotation, whereby particles detached from the yarn will enter said rstmentioned recess means, move radially outwardly on said surface and bedischarged through said second mentioned recess means.

2. A device according to claim 1, wherein said surface has a downwardlyand outwardly inclined annular zone for directing particles towards saidsecond mentioned recess means.

3. A device according to claim l, wherein said surface has an annularzone for frictionally engaging the outer periphery of said rotatablymounted disc.

References Cited in the le of this patent UNITED STATES PATENTS1,630,426 Hasbrouck May 31, 1927 2,629,561 Heizer Feb. 24, 1953 FOREIGNPATENTS 413,601 Great Britain July 19, 1934

